$\left(y+7\right)\left(y-7\right)$
$\frac{\left(x^{-1}y^{-4}\right)^4}{2y^3\cdot x^{-1}y^4}$
$\frac{8x^2}{4x^5}$
$y'=x+xy^2$
$\log_a\left(3\right)+\log_a\left(5\right)$
$-9.76z\:+\:3.14z$
$s^2-5s-5$
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